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Magnetoresistive Sensing of Print Actuators

Publishing Venue

IBM

Related People

Mazzeo, NJ: AUTHOR

Abstract

Using two magnetic resistors (M-Rs) as sensors, in a temperature- and magnetic-disturbance compensated bridge, provides a robust feedback sensor for improving print actuator dynamics. Printer quality and speed are enhanced by feedback control on the hammer. In order to achieve this feedback, a method of sensing hammer location and velocity is required to determine the force at impact. The figure shows a small permanent magnet 1 attached to hammer 2. The M-R sensor 3 is held in a position that allows the magnet 1 to move over the M-R sensor 3 in a bridge 4 (R1-R2) which can adjust the DC level to zero. Two M-R sensors are used; M-R sensor 5 is mounted next to M-R 3. This makes the sensor track for temperature and also subtracts any external magnetic disturbances.

Country

United States

Language

English (United States)

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Magnetoresistive Sensing of Print Actuators

Using two magnetic resistors (M-Rs) as sensors, in a temperature- and
magnetic-disturbance compensated bridge, provides a robust feedback sensor
for improving print actuator dynamics. Printer quality and speed are enhanced by
feedback control on the hammer. In order to achieve this feedback, a method of
sensing hammer location and velocity is required to determine the force at
impact. The figure shows a small permanent magnet 1 attached to hammer 2.
The M-R sensor 3 is held in a position that allows the magnet 1 to move over the
M-R sensor 3 in a bridge 4 (R1-R2) which can adjust the DC level to zero. Two
M-R sensors are used; M-R sensor 5 is mounted next to M-R 3. This makes the
sensor track for temperature and also subtracts any external magnetic
disturbances. The waveforms inset in the figure show the following: Force, the
output Kistler cell 7; Position, the output of M-R sensor bridge 4; and Power, the
current applied to drive coil 6. The M-R sensor signal is the basis for monitoring
the velocity of the hammer, and for adjusting the coil current pulse to maintain
proper print dynamics.